The is a wonderfully simple 5V power source from Bodhilabs.com . This unit uses a single AA battery and generates 5V using a DC to DC step up circuit. A jumper is provided on the unit to disconnect power and includes a terminated (right is red) connector. Perfect for all those 5V applications that need to be small, and run on less than 100mA.
• Voltage regulation: +5V +/-3%
• Typical current: 100mA or less.
• Typical ripple: 150mV peak-peak (*) @ 135kHz